Fri, 01 Nov 2019 11:29:40 +0100 wenzelm clarified error;
Thu, 31 Oct 2019 22:34:16 +0100 wenzelm more accurate proof_boxes -- from actual proof body;
Thu, 31 Oct 2019 21:21:09 +0100 wenzelm clarified signature;
Thu, 31 Oct 2019 14:29:29 +0100 wenzelm clarified signature;
Thu, 31 Oct 2019 09:02:02 +0000 haftmann more lemmas
Wed, 30 Oct 2019 18:30:28 -0400 immler merged
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